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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '43ba980886edecbd3eff71ab9d4fb59e308ae2d37d645c787e9b683259818b73' 
  AND token = 'CPJqt2IfvMQRwFghiTMR2oI0pgrBt6uAb7bivnMxSLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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