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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ecd697b97b351d3dc63d243896183931d2876fefcb6f91f54a237253a31e9188' 
  AND token = 'Kf91TWqJhb/CdmUPxpvszrANT0ijdAsRdIo3c7NUMUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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