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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f74ba903e323ccd6e900b1a6e7e21e6992eb9118c0c557e131185099e4af52f7' 
  AND token = 'vko47TTgRTafI59GDShb5KuoF1g5lj/sa1Q52er6G1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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