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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '23b7a75fe1375c54c1ea426082725100fa607e20d7ef8a0e0debae73a638c0e1' 
  AND token = 'dqPYujD/6520I9SW9Ram3GAHLgc8a1byYf/I1Yre3pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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