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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab3af4e2b0e602b10e69165e83396652a5b25106773cec07e4e0b2338475e62e' 
  AND token = 'DBK4OVCC1Cp2hMbOGrFlXB0huJvMjs34IpRd52stjVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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