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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7760e7d6548001888ac4fc015830ec9707a15ef174bc707fb10113b388457368' 
  AND token = '9mJpMSLbK6/4mB8I+5UK7CvCI4VexJ+L9EzXCeKtGY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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