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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6be5ea27b0bcc1b396982123bdbbc4db26d0002f2bd2e2f17299b733628ee6d0' 
  AND token = 'y8IyUYoWgO1dFYhtCFHng3uRcUDMgB1MDmc8Kc1A96I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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