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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3e098ef0d286b99baa03cc8d438d2133ac5717cf7f9d27b16dbc4df2b74f66b4' 
  AND token = 'QOb4Ss35iJma65Fc9HYZmRZ7DudRHwlHEdhO4f/mk4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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