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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1cf7fe6d5c9e708760658357fb5ae82f567cd0957ea8c9f9892a91138ae3821f' 
  AND token = 'O1jIMSM/nfo13gUrsS8aywXfchIcD2Gvc62T47HDN34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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