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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8a97e8153b6dda1c299e553ae3f33c51010c1af1f21dc718ef391a492a32cb72' 
  AND token = 'KzU2qlWbR0MO4KsUzJ9nRIXSDCsbGtZvrafy/CU+wT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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