Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c83f650f83954552418d3a14eaf9803f5bc37e2f9d0bb4e6112cf09fff2c18' 
  AND token = 'mM6/sdGyT7Il+y5cl5TvdyL5Mmmjf/LFsg4C9K0J/h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}