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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8eafd91ddd17ae070db83b10a17732395885cae8deb8852f09399acda94d2b1e' 
  AND token = '7kTd/yZ0Jh+gvSUx4PutBSr4bZ2Ox+EsB0VFbiq46xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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