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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a53291eadb04b4398286fdf0b6c52bd46fce44a8b68373a4873353e3caf8c56f' 
  AND token = '7LUGYAzRe7fneuIlGx4AIZPldEREEyFUY17cvOBpVqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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