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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f88179d97962d74ddbfa7dd123a881bb88c178de505458108c719e75963394f4' 
  AND token = 'gp6W3YWvNYh8uu8ZOdcL55IHgN7UEWWPd/SlLZFKDjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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