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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1951ea9d2f01deeb0ce4f1bf425397e3948a6b3a34416d19ae534a7f19e62948' 
  AND token = 'KM6v713Ao2++PAi/sVo0Xq4AjpuXk0gEnF5+jNdvxIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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