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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da1d0c4c1aec66a3a1f1ca0e2e7cb6382296591f286c2e0510b843423f68a5d3' 
  AND token = 'uY+n7rV/li0Od4bAYtp9mmva1nzxDxxAUYomUDeP15k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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