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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb29db19f237e1a1827234927ad738636146adfd24f6c097fea656f98ab4b13c' 
  AND token = 'vgMo6e5o3iZ9C3zyMaZ58co1wvKSDUr+Ev71uL5t4uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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