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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0eaa5fba0a876d5aa5491f5424687ac16af8664d096b97228a093b2939c89335' 
  AND token = 'c9EzdvZM5WtlLk3scYe8QXJ4CgKjbGatONiOOjIWOi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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