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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd8e8b7a42a7d9e62124c940b3d218f6ecb2ea3454417d4d984400702d30faae4' 
  AND token = 'CXgRZRk4n24uqjMJjSd9sxpN48/TW/GHxbFyETJfh40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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