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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc9b50e2cc3f659773dacd093a599f82e34af4eeecab8937a1f90a2af31e6cbc' 
  AND token = 'xWMU5SxLoljZ4ALLs0DPe55bRcJafQC85OtVhifpBmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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