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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a4beb48aa4bb32b184bd607a0ac3ff9299c88f363f1b59bc09e9895722e23e2' 
  AND token = 'JVx6ngWPC48f4+4+5QSNmRMxGwMxReSQgSoSUFxCyho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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