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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8466c15a39e1d7fb8ae8a20a6300bea60f9de66af82328577189f7c049447e15' 
  AND token = 'Io4xORAeSSGA2I58FikxMXus4lYv5Xksp4LmaR5tLK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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