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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '41fa8084a8b4eed82577a1bf7ade65b5a12588c2acf97931ec72a1ce9f1de574' 
  AND token = '5bv4lwLAPU7sDbKpjPxSci/SFvbsyXoLzyuYiUKbx2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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