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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad6a939e97569af8b3aaf4d994ad3c07fc3092bcf63f65c363d67d3f7eddb42f' 
  AND token = 'saunVtl6JIwR/Svne8aLHsTr/pscJ4dau51EUi+82Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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