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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9fb29e8deb9a923cf1cefecb00db4326d4a8d10bf2ce03475bc9792c54a90754' 
  AND token = 'RqgnHeK5VxJn6hBsRbnUHi04g/upez1yHeSsestNG+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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