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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '65396fe4b81bfed0fcd6ccb481732d7c898ff9890f7c1ca02c36e8ceea591e8d' 
  AND token = 'HOEw3HNYnFWgd7YptwH/c85X9/ZY6rFTqvJYr1wrR68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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