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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c12f80f76fa2a2781cd21d6d0ee79a5592d08c775e2607b7bccaea87eced7dee' 
  AND token = 'eFF6WOug6JBY4dUPkj4Mm0W5LtjvBIBW2SNPP96PNOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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