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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee813e2999817b778906e56e6ee0524b26b6d241abe4e3908ee4542269540b39' 
  AND token = 'PMvQ56Wk0BTm/ECSmmdAMiV/C7f/mxfV6LL9yzvP1DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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