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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a9510fb7b112da20241a3ac9c8ec6d70b85d553b9319d873ecca99d7f053105' 
  AND token = 'V6iuiZvxtgBPnK9n8wKP0FpinsM1a0DCW9jIbJeAUxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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