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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ca20c996268c50c09c8143bb6ed71894571f34c67cb4918077a5ba9d0dad62d' 
  AND token = '5NvQDNMaG23xEtohYFIu6e5c0yJqmZkitz8Hc6Q2YkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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