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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0f9043f4f0839384ae12982f3e0605250a66803dc7ce0e52a48c0eb6eaaf96a' 
  AND token = 'OTsViyWiisrRnohrCboYcLX2EEkHO/E+EUiOXwhC7bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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