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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f0db09bffaea4feee64a746b30a38d04dd74df624a2088162a8c70adac0d568' 
  AND token = 'OKDusZDRmVFXbY85I4gq2OkyVUrjDErQY6cz5aDtsnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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