SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b568ec7a64300a7a085c9a266242fc124e166699348757b0e65bfc9d789dbe4d' 
  AND token = 'MahEqdadchGT/ufi/OPStF3JqWmLjqRKIZS2nX35S7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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