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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71cc88c4ec4f51e88b13e245e823aee66b9a7eb51e05b5df7ce698181a3e1196' 
  AND token = '4G/FDivO9EozKf3OD/3+02PfXETU650K9gu1VukExvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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