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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d1078fb4b0423c8e19dbd64e9f6ac8a0016340a2775e13b4b214b4c3f0a30c2' 
  AND token = '4pquIHSh6608HIvsyEzH8sC6nhMu/oat3L6P1tsXl7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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