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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d5bd1ab7f231f19ac5590f2297af63ae146128ab3d65d5203e4c1b06e32f58d' 
  AND token = 'oVqoFvPhbLo6JkAIiIuPMjwdCYIQONXwObvLGE33cfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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