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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3f29afd1ff8ea13cbbef333b3bc9de89d19933819b197a61b0fa2a7b2d19f69' 
  AND token = 'X4z9VvuGVFhGfqfX3YOHTwi058j6p9jh9lJ7WlWF504=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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