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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7c5211195f76ebd76305edbdf494de5d2e19ffa5fdeab7663dc42f113e91c1b' 
  AND token = 'A9Slf63P5/Me/nygQj08cxsdIsLXrNdq0yO1WiElKhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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