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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8260e4082806189f079976741c98b30e4d7f0fa8fab4a6385b0363757a0609e2' 
  AND token = 'FGxO09F8UHnkFLQWVJtj7xzI3M0+Zlt5+aWSwyVdt1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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