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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e11aa2c5507823827693f414077170ae87420203c8c9e257b3aa6ff257b97e58' 
  AND token = 'h2r6v5S3Tb6S28OEinafnuvcVEE778eYCsJ/FG07nXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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