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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c4854a357acee851c2ad8d48a2cb18f99360024a73c770843dd21a7ba509e36' 
  AND token = 'gUqpGdQ1NoMTyIW6N71T+QGplD+m9uf6KoCH4lYROtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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