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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0c8e24d8c88aabf4e8f91e8d0a056a1415effec09ca39d0dfc1a7d589054d845' 
  AND token = '+ZdMoCE/6MlSE3rXnzOPysVfkbbAGm/gdmLEVjEus3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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