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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b59c3dd4151e7995a8f1a8d608c2fbdcc8d430895541cc11cb9ad12db045954' 
  AND token = 'Eq0o2QhvYJXTgek+HX9Mk/4bGnUnLqP74mmG+sGiTMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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