SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '459e52522ddc7d72929b9d3bd8a2fc28fb2691fa08d1c34369c5300faeb1fc92' 
  AND token = 'hY5pK8IgJFKz4aoxX53FDyyZKd0AwYSs+ulNqP/2a6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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