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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70f44d42e0ac825c914674b03dfbdddef6d9292acbdc21b49bb0f7299e7f69d7' 
  AND token = 'jJp/26yFi2j/cPE6/3JcB2SWd3NwtXLHMGgGSOCI8GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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