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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df3d06f3a1c6a66bdd3f59580e03d8734e655a8254b48a18a537913e36c5ad05' 
  AND token = 'UYZ3PGj5Z7vSWVAnfeVgEl5BU/rC8hN1tdAioHRMo2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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