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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5c0555b6b36b1a15e470170d8a8ae34e70030e8991a74a813f1b0722eb37b339' 
  AND token = '4joNBSZ60t7P5XVo+0BD45nLOoVWG1rCyXjkWN0lHSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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