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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f9d661dd7d72f96d54c97969033018240277bfb5e02a740c3b3426e98cec7cf' 
  AND token = 'ykER67GbmQDHbPtgR/emo/Xx1wANakY5WIp6WODGDek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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