SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01b48350cda6690fd322adb4021e7473f5cd282aa68f997727322082fde1d4a7' 
  AND token = 'UNaecFDfAsw1tGGShxYPPlrabz1SS+r9r/rFVDdjQ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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