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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '40c4c6edd63818c7e6cc19b493049461ed7b55fbacaa6beb7b33b520b88edaf4' 
  AND token = '5WK35ligUxZrvDApZkjddErT6tLRRwnAwDdNeQ3KgzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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