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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a908c64bae356704a8d43e88a3b4a9663a6d0fc24dc5bc8987611d00d8dece59' 
  AND token = 'BezDkCHD8MEbju4a6+0WanSP3cmj3vDMkEzCO1KexAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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