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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f48379cdd012575b60048752083dcc9652cc1ffc0b832e0f538eb4622237202' 
  AND token = 'XtxgUsNExGPUnoSQTc539wjT+YEojubin7SC7nagabg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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