SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '37e88c4c6633e3cc8da5d066f490b49ee5c2a5bb90704149fd13b844ebb1696c' 
  AND token = 'S7BpwvvzaXOqWYFTBShevqcr7c6/XRRcL25sYRXZZLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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