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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '52aff0bc8878ceb5c19415b8ee18361c8f3733d2ac6e16fa160eccf94b6ec2a6' 
  AND token = 'EJau2D8I0L6xvXCTs83guRnFWf0pXtadAcHDBt6rPdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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