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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '635d93e14e981a2040741d4a380af33cf76622ecacd3fe3dde4cdb2f206d2bbb' 
  AND token = 'JrKkfDYCJqJUFZreQB9UZkaf1PH9QBBY36nGfs4puoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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