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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e7aeea9768a3fc92ff57e7fc61515e805e7ae4f44fec8139f9527bb3d5d314f' 
  AND token = '5C62vR/+gmSy6M+0hjiR0z5WV0Kcc4+yE4Sqds1gbIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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