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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b6d4d7331c9a66732073c86aaf641ef1ea74164f693010291be020bca1c1c41e' 
  AND token = 'E0WOiKWNZZQDB/waoKjeiWIeE+9/r+9YoEsm5CquSPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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