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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f7b7d21c15f20e4b58faf17ec4868b00515c4b160577ffe7fdec5bb93c44ea14' 
  AND token = '33MFplJi0VKcXq2Bdf0wQptJ0WQzptmHthl6HznOw5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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