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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '36b1d0dc93dcf73b82d0a5dcda1cf94ac5f424e30438bdec06170de67604f712' 
  AND token = 'v74CgQ9ghiIGp5i2WuCiIr/4Givk5Hv5JGJ2fFIVRSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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