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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '663468cae0b7ee3b3452fd43029f6f6a4877e35191614e3647585a0ad45ac77d' 
  AND token = 'qy3t6ruVp917QbFnhF+d50nuVz5Uv1xUTCMLkAcNgO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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