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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5859faeb2aa1dd1d51947c06a1e40fb58a2408841967278e3d0d5fcefc8d4d76' 
  AND token = 'udHTgtu/KX9/5iEXSaj8EKH5xUH1P19qAmFUnoOMvPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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