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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13c1f9f27fd4da66eb5c12c33184b1c15eb4114260dd0fa1fbd918d33e3ded80' 
  AND token = 'Jko0ONl0yBZJrs9sIYpmfB67WqenQcd8gLXT4oCqd7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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