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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7b2a997c0f6efc30775f7847786fd891bb6c9c1dda6a50ada4ab6fed93985c9' 
  AND token = 'vbIgqPUTNTtihFEFHuMF4/VxNO243Z/9RfnqpU28lSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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