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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c8e38a24baf9cafa153ac56a43f7f0fb907689d56a783bb42347e986aae0f139' 
  AND token = 'TNfBE4ij7k3Sj9jZSkQN3S+lah1sYjMOd9eL8ashuVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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