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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b7591441ab08b9ec971e3b1e34a90a0531e2f6918677d17eb1de586e4ff456a' 
  AND token = 'VTcWtjoFUxnwmvr0bYAUymYVTkHuBdjajAmAvelbctI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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