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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '86db29114c13b2dff860ec329aa00377521242accd9e1308635a08c4885bc2b7' 
  AND token = 'tgbdow/ymJCtYX/eiQoQ5A1VCgCoq1gy9Z5q8GeVxQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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