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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d72cf54679d6d52ae1d8e2f6f70b530f4486f96404023cf63af98e5e62feb7e' 
  AND token = 'g2if8sIoWpPoq0Z8C9dr7sGzNX0GK3O2aKOUCgWnY5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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