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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '64ef4ae19f66b0c9b37d0d4b3fcbdb4e4f32e2ebc5a36b30748c3b0a2b98b4b8' 
  AND token = 'tw1aB8MaFLtAJ9NL7d+WQLrBoqdHr1FwDJirZZBeB1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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