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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd77c68dc639166d558662c7ae6e346d9e77f19566cb2cdb0aa15a3159c371c9a' 
  AND token = 'SZd15jEimL/1vZ4qLrj3fmNXhNHj50yO8PnCrwlc/Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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