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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1aaaaa99c9dedb339dfed390bfdbfb8a3ed7cd62dcc4ecb8f7e5d87b74f98fdc' 
  AND token = '3SOWkJ/bj+3QdCwaoPLTaIPEnRQdga3IEq9qrABfJIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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