SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '293e25329838075a031e769212dc10441f46697a28e6d35726f703b33172a156' 
  AND token = 'i07q82TwCDDnhXkDMzRxrO9gPioKHrvjtaufXRpA0BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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