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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd059be8a20524d7f97d20d3271d48909a066d3e9918980599147c566d8ae1757' 
  AND token = 'fkagAUbiMDuDPpDj65+B51xxgctCOG8RK7P4MtB3S4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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