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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '90a100fd0290f4b0d1234c90e4b11a4da6195caba9a6574fd640a4512b5ebd10' 
  AND token = 'qaTTbl+C+UAgPvkAr3AOcqlxCFj18p5lg9HWuBlr9Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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