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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5574087089f2e542eeb4dafe5a111dfb03bd5d0dbcd573af6c0f01e4bd6095b' 
  AND token = '6M+plyHxviqwx/WsYWrub2veNG09atb/xFNSN7kERs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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