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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6eabd420fff13d4e2af38d3c0e58de076f628bc291eb2cd2e1e957d1cfc3d68' 
  AND token = 'dO2k0hXjIKvQ6281ooFCsXl0fnRBsDaM4bSbqFwcRFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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