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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cb0f7580d0c64e7dffe1bc3744b5f19229dcfd73dd6b472625f82cd1f00360c1' 
  AND token = 'qNNNA2DktIYCs693VVjDKxTGPZ53P30waYkYdDfhic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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