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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c880a01ea440fcffcf102ffef35d78abf45508bc99c0dd089cc3caca65dd09e' 
  AND token = 'JsAxocQgzCLxFM5QsKeiqiK/ZpQvotFjPPkm0Qq2iO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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